/*
* Copyright (c) 2007 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* compliance with the License. The rights granted to you under the License
* may not be used to create, or enable the creation or redistribution of,
* unlawful or unlicensed copies of an Apple operating system, or to
* circumvent, violate, or enable the circumvention or violation of, any
* terms of an Apple operating system software license agreement.
*
* Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
/*-
* Copyright (c) 1999, 2000, 2001, 2002 Robert N. M. Watson
* Copyright (c) 2001 Ilmar S. Habibulin
* Copyright (c) 2001, 2002, 2003, 2004 Networks Associates Technology, Inc.
* Copyright (c) 2005 SPARTA, Inc.
* All rights reserved.
*
* This software was developed by Robert Watson and Ilmar Habibulin for the
* TrustedBSD Project.
*
* This software was developed for the FreeBSD Project in part by Network
* Associates Laboratories, the Security Research Division of Network
* Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
* as part of the DARPA CHATS research program.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
#ifndef _SECURITY_MAC_INTERNAL_H_
#define _SECURITY_MAC_INTERNAL_H_
#ifndef PRIVATE
#warning "MAC policy is not KPI, see Technical Q&A QA1574, this header will be removed in next version"
#endif
#include <string.h>
#include <sys/param.h>
#include <sys/queue.h>
#include <security/mac.h>
#include <security/mac_framework.h>
#include <security/mac_policy.h>
#include <security/mac_data.h>
#include <sys/sysctl.h>
#include <kern/locks.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/sbuf.h>
#include <sys/proc.h>
#include <sys/systm.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/vnode.h>
#include <mach/sdt.h>
/*
* MAC Framework sysctl namespace.
*/
SYSCTL_DECL(_security);
SYSCTL_DECL(_security_mac);
extern int mac_late;
struct mac_policy_list_element {
struct mac_policy_conf *mpc;
};
struct mac_policy_list {
u_int numloaded;
u_int max;
u_int maxindex;
u_int staticmax;
u_int chunks;
u_int freehint;
struct mac_policy_list_element *entries;
};
typedef struct mac_policy_list mac_policy_list_t;
/*
* Policy that has registered with the framework for a specific
* label namespace name.
*/
struct mac_label_listener {
mac_policy_handle_t mll_handle;
SLIST_ENTRY(mac_label_listener) mll_list;
};
SLIST_HEAD(mac_label_listeners_t, mac_label_listener);
/*
* Type of list used to manage label namespace names.
*/
struct mac_label_element {
char mle_name[MAC_MAX_LABEL_ELEMENT_NAME];
struct mac_label_listeners_t mle_listeners;
SLIST_ENTRY(mac_label_element) mle_list;
};
SLIST_HEAD(mac_label_element_list_t, mac_label_element);
/*
* MAC Framework global variables.
*/
extern struct mac_label_element_list_t mac_label_element_list;
extern struct mac_label_element_list_t mac_static_label_element_list;
extern struct mac_policy_list mac_policy_list;
/*
* global flags to control whether a MACF subsystem is configured
* at all in the system.
*/
extern unsigned int mac_device_enforce;
extern unsigned int mac_pipe_enforce;
extern unsigned int mac_posixsem_enforce;
extern unsigned int mac_posixshm_enforce;
extern unsigned int mac_proc_enforce;
extern unsigned int mac_socket_enforce;
extern unsigned int mac_system_enforce;
extern unsigned int mac_sysvmsg_enforce;
extern unsigned int mac_sysvsem_enforce;
extern unsigned int mac_sysvshm_enforce;
extern unsigned int mac_vm_enforce;
extern unsigned int mac_vnode_enforce;
extern unsigned int mac_label_vnodes;
extern unsigned int mac_vnode_label_count;
static bool mac_proc_check_enforce(proc_t p);
static __inline__ bool
mac_proc_check_enforce(proc_t p)
{
#if CONFIG_MACF
// Don't apply policies to the kernel itself.
return p != kernproc;
#else
#pragma unused(p)
return false;
#endif // CONFIG_MACF
}
static bool mac_cred_check_enforce(kauth_cred_t cred);
static __inline__ bool
mac_cred_check_enforce(kauth_cred_t cred)
{
#if CONFIG_MACF
return cred != proc_ucred_unsafe(kernproc);
#else
#pragma unused(p)
return false;
#endif // CONFIG_MACF
}
/*
* MAC Framework infrastructure functions.
*/
int mac_error_select(int error1, int error2);
void mac_policy_list_busy(void);
int mac_policy_list_conditional_busy(void);
void mac_policy_list_unbusy(void);
#if KERNEL
int mac_check_structmac_consistent(struct user_mac *mac);
#else
int mac_check_structmac_consistent(struct mac *mac);
#endif
int mac_cred_label_externalize(struct label *, char *e, char *out, size_t olen, int flags);
int mac_vnode_label_externalize(struct label *, char *e, char *out, size_t olen, int flags);
int mac_cred_label_internalize(struct label *label, char *string);
int mac_vnode_label_internalize(struct label *label, char *string);
typedef int (^mac_getter_t)(char *, char *, size_t);
typedef int (^mac_setter_t)(char *, size_t);
int mac_do_get(struct proc *p, user_addr_t mac_p, mac_getter_t getter);
int mac_do_set(struct proc *p, user_addr_t mac_p, mac_setter_t setter);
#define MAC_POLICY_ITERATE(...) do { \
struct mac_policy_conf *mpc; \
u_int i; \
\
for (i = 0; i < mac_policy_list.staticmax; i++) { \
mpc = mac_policy_list.entries[i].mpc; \
if (mpc == NULL) \
continue; \
\
__VA_ARGS__ \
} \
if (mac_policy_list_conditional_busy() != 0) { \
for (; i <= mac_policy_list.maxindex; i++) { \
mpc = mac_policy_list.entries[i].mpc; \
if (mpc == NULL) \
continue; \
\
__VA_ARGS__ \
} \
mac_policy_list_unbusy(); \
} \
} while (0)
enum mac_iterate_types {
MAC_ITERATE_CHECK = 0, // error starts at 0, callbacks can change it
MAC_ITERATE_GRANT = 1, // error starts as EPERM, callbacks can clear it
MAC_ITERATE_PERFORM = 2, // no result
};
#define MAC_CHECK_CALL(check, mpc) DTRACE_MACF3(mac__call__ ## check, void *, mpc, int, error, int, MAC_ITERATE_CHECK)
#define MAC_CHECK_RSLT(check, mpc) DTRACE_MACF2(mac__rslt__ ## check, void *, mpc, int, __step_err)
/*
* MAC_CHECK performs the designated check by walking the policy
* module list and checking with each as to how it feels about the
* request. Note that it returns its value via 'error' in the scope
* of the caller.
*/
#define MAC_CHECK(check, args...) do { \
error = 0; \
MAC_POLICY_ITERATE({ \
if (mpc->mpc_ops->mpo_ ## check != NULL) { \
MAC_CHECK_CALL(check, mpc); \
int __step_err = mpc->mpc_ops->mpo_ ## check (args); \
MAC_CHECK_RSLT(check, mpc); \
error = mac_error_select(__step_err, error); \
} \
}); \
} while (0)
/*
* MAC_GRANT performs the designated check by walking the policy
* module list and checking with each as to how it feels about the
* request. Unlike MAC_CHECK, it grants if any policies return '0',
* and otherwise returns EPERM. Note that it returns its value via
* 'error' in the scope of the caller.
*/
#define MAC_GRANT(check, args...) do { \
error = EPERM; \
MAC_POLICY_ITERATE({ \
if (mpc->mpc_ops->mpo_ ## check != NULL) { \
DTRACE_MACF3(mac__call__ ## check, void *, mpc, int, error, int, MAC_ITERATE_GRANT); \
int __step_res = mpc->mpc_ops->mpo_ ## check (args); \
if (__step_res == 0) { \
error = 0; \
} \
DTRACE_MACF2(mac__rslt__ ## check, void *, mpc, int, __step_res); \
} \
}); \
} while (0)
#define MAC_INTERNALIZE(obj, label, instring) \
mac_internalize(offsetof(struct mac_policy_ops, mpo_ ## obj ## _label_internalize), label, instring)
#define MAC_EXTERNALIZE(obj, label, elementlist, outbuf, outbuflen) \
mac_externalize(offsetof(struct mac_policy_ops, mpo_ ## obj ## _label_externalize), label, elementlist, outbuf, outbuflen)
#define MAC_EXTERNALIZE_AUDIT(obj, label, outbuf, outbuflen) \
mac_externalize(offsetof(struct mac_policy_ops, mpo_ ## obj ## _label_externalize_audit), label, "*", outbuf, outbuflen)
#define MAC_PERFORM_CALL(operation, mpc) DTRACE_MACF3(mac__call__ ## operation, void *, mpc, int, 0, int, MAC_ITERATE_PERFORM)
#define MAC_PERFORM_RSLT(operation, mpc) DTRACE_MACF2(mac__rslt__ ## operation, void *, mpc, int, 0)
/*
* MAC_PERFORM performs the designated operation by walking the policy
* module list and invoking that operation for each policy.
*/
#define MAC_PERFORM(operation, args...) do { \
MAC_POLICY_ITERATE({ \
if (mpc->mpc_ops->mpo_ ## operation != NULL) { \
MAC_PERFORM_CALL(operation, mpc); \
mpc->mpc_ops->mpo_ ## operation (args); \
MAC_PERFORM_RSLT(operation, mpc); \
} \
}); \
} while (0)
#
struct __mac_get_pid_args;
struct __mac_get_proc_args;
struct __mac_set_proc_args;
struct __mac_get_lcid_args;
struct __mac_get_fd_args;
struct __mac_get_file_args;
struct __mac_get_link_args;
struct __mac_set_fd_args;
struct __mac_set_file_args;
struct __mac_syscall_args;
void mac_policy_addto_labellist(const mac_policy_handle_t, int);
void mac_policy_removefrom_labellist(const mac_policy_handle_t);
int mac_externalize(size_t mpo_externalize_off, struct label *label,
const char *elementlist, char *outbuf, size_t outbuflen);
int mac_internalize(size_t mpo_internalize_off, struct label *label,
char *elementlist);
#endif /* !_SECURITY_MAC_INTERNAL_H_ */